About a month ago I had a cyst injected with kenalog twice. A week later an indentation developed. Is it permanent?

Kenalog injections can cause a temporary indentation or atrophy.  Depending on the amount used and the location of the injection, the atrophy may last for a few to many months.  Treatment is not usually necessary, but if the depression is very obvious, hyaluronic acid fillers can be used to temporarily fill in the area.  You do not want to use a long-lasting or permanent filler since you will have over-correction as your own skin recovers. Laser treatment will not help.